Incision and drainage of a deep abscess or hematoma in the soft tissues of the neck or thorax
Verified May 8, 2026 · 6 sources ↓
- Medicare
- $517.71
- Total RVUs
- 15.5
- Global, days
- 90
- Region
- Other
Documentation requirements
What must appear in the operative or office note to support the claim.
Source · Editorial brief grounded in 6 cited references ↓
- Specify depth of infection or hematoma — explicitly document that the abscess or hematoma involves deep soft tissue, not subcutaneous layer alone
- Anatomic location within the neck or thorax, including laterality if applicable (e.g., left posterior neck, right anterior chest wall)
- Description of intraoperative findings: estimated volume of fluid drained, character of contents (purulent, sanguineous, serosanguineous), presence of loculations
- Operative note must name the surgical approach and depth of dissection required to access the abscess cavity
- Pre-operative diagnosis with supporting ICD-10 code (e.g., deep neck space abscess, post-traumatic hematoma) — must align with procedure indication
- Any cultures sent intraoperatively should be documented, along with drain placement if applicable
Applicable modifiers
Modifiers commonly billed with this code.
Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual
What this code covers
Source · Editorial summary grounded in 6 cited references ↓
CPT 21501 covers surgical incision and drainage of a deep-space abscess or hematoma located in the soft tissues of the neck or thorax. The key word is 'deep' — this code applies when the infection or hematoma has penetrated below the superficial subcutaneous layer into deeper soft tissue planes. Superficial neck or chest wall abscesses drained in the office or ED typically fall under skin and subcutaneous I&D codes, not 21501.
The 90-day global period means all routine follow-up visits, wound checks, and dressing changes through day 90 are bundled. If the same surgeon performs a staged or related return procedure within that window, append modifier 58. An unplanned return to the OR for a related complication — repacking, re-drainage — takes modifier 78. A separate, unrelated procedure in the global window takes modifier 79.
Laterality modifiers LT and RT are applicable when the site is clearly unilateral. When same-day E/M is billed alongside this procedure, modifier 25 is required on the E/M to survive NCCI edits. If a second surgeon performed the same drainage on the same day due to repeat necessity, append modifier 77.
RVU & reimbursement
Component RVUs and Medicare national rate. Actual payment varies by GPCI locality.
Source · CMS Physician Fee Schedule, RVU26A · January 2026
| Work RVU | 3.88 |
| Practice expense RVU | 10.79 |
| Malpractice RVU | 0.83 |
| Total RVU | 15.5 |
| Medicare national rate | $517.71 |
| Global period | 90 days |
Payment by site of service
Medicare pays different rates by setting. HOPD typically pays substantially more than ASC for the same procedure.
Source · CMS OPPS Addendum B·ASC HCPCS payment rates·2026
| Setting | Medicare rate (national) |
|---|---|
Office (PFS non-facility) Procedure performed in physician's office | $517.71 |
HOPD (APC 5073) Hospital outpatient department | $2,967.63 |
ASC (PI A2) Ambulatory surgical center (freestanding) | $1,248.36 |
Common denial reasons
The recurring reasons claims for CPT 21501 get rejected.
Source · Editorial brief grounded in CMS NCCI edits, AAOS coding appeals, and cited references ↓
- Depth not documented — payer downcodes to a superficial I&D code when operative note doesn't explicitly confirm deep tissue involvement
- Laterality missing when LT or RT modifier expected by payer for unilateral soft-tissue procedures
- Global period conflict — unbundled follow-up visit billed without modifier 24 (unrelated E/M) or 78 (related return to OR) during the 90-day window
- Diagnosis mismatch — ICD-10 code reflects a superficial or skin-level abscess rather than a deep soft-tissue or deep neck space infection
- Missing modifier 25 on a same-day E/M, causing automatic bundling with the surgical procedure under NCCI edits
Frequently asked questions
Source · Generated from the editorial pipeline, verified against 6 cited references ↓
01How do I distinguish 21501 from a superficial neck or chest I&D code?
02The patient returned to the OR 3 weeks post-op for re-drainage of a recurrent abscess at the same site. Which modifier applies?
03Can I bill a same-day E/M with 21501?
04Is 21501 appropriate for a post-operative hematoma drained in the office?
05Does 21501 carry a 90-day global, and what does that include?
06Should I use LT or RT modifiers on 21501?
Sources & references
Editorial content was developed using the following public sources. Last verified May 8, 2026.
- 01CMS Physician Fee Schedule 2026
- 02aapc.comhttps://www.aapc.com/codes/cpt-codes/21501
- 03mdclarity.comhttps://www.mdclarity.com/cpt-code/21501
- 04cms.govhttps://www.cms.gov/medicare-coverage-database/view/article.aspx?articleid=56766&ver=21&
- 05aaos.orghttps://www.aaos.org/globalassets/quality-and-practice-resources/coding-and-reimbursement/resident-guide/resident-guide_modifiers.pdf
- 06cms.govhttps://www.cms.gov/medicare/regulations-guidance/physician-self-referral/list-cpt-hcpcs-codes
Mira AI Scribe
Mira's AI scribe captures the depth of dissection, anatomic location, laterality, and character of drained contents directly from surgeon dictation. It flags when the operative note uses vague language like 'soft tissue abscess' without specifying deep versus superficial involvement — the single most common documentation gap that triggers a payer downcode or denial on 21501.
See how Mira captures CPT 21501 documentation